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    Question

    Identify the gas that is not considered a permanent part

    of the Earth's atmosphere.
    A Neon Correct Answer Incorrect Answer
    B Helium Correct Answer Incorrect Answer
    C Xenon Correct Answer Incorrect Answer
    D Methane Correct Answer Incorrect Answer

    Solution

    Methane, unlike Neon, Helium, and Xenon, is not a permanent component of the atmosphere due to its variable concentrations influenced by biological and geological processes.

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